It's been stuck in my head for weeks. It's a techno song with NO LYRICS. It goes like this:
Da (F)
Da (C)
Da (A)
Da (G) da (G) da (F) da (E) da (F)
Da (E)
Da (C)
Da (A)
Da-a-a (F)
Da (G)
Da (A)
Da (E)
(repeat)
The capital letters in parentheses are my rough guesses for the actual notes, so, if you have a keyboard handy, you can play and hear the melody. Here's a free, online virtual piano if you need it: http://www.musipedia.org/musipedia.swf (Thank you, pianoman74!)
Thank you so much for all your help!